Hand quilting thread has a finish on it to make it stronger than regular sewing thread. When stitching through several surfaces,it has to be strong. We used to use beeswax with regular thread pulled through it for strength, now one can buy the quilting thread. I made the hexagon quilt top with paper piecing by hand and used regular sewing thread with part polyester in it but using quilting thread will just make the joinings stronger, a good idea.
Everyone has an opinion and listen to them all and sort out the ones that make sense to you and what you have on hand or can purcase.
Use what you have, it is perfect for hand quilting.
Carol J.